Juan Veldez
Well-Known Member
Anyone know a good source for 904 with a gearvenders overdrive? I promise I will not hammer this 340 with 10.5 comp and 3.91 gears and blow it up!
904 w/ a gearvenders
- Thread starter Juan Veldez
- Start date
moparleo
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Really? 340 with a 904? And you want overdrive.
Contact Gear Vendors for their recommendation.
Contact Gear Vendors for their recommendation.
Xcudame
Well-Known Member
I would think the 5 clutch 999 would be the better choice instead of a 904. Better yet would be a 518 (727 with better overdrive). The 518 will bolt right in with a few notches on the housing webbing and a modified cross member. Gear vendors are so long that the driveshaft angels need to be seriously measured and corrected.
pschlosser
Well-Known Member
I too was thinking 518 swap. If he keeps the 3.91s, he can go non-locking TC for a simpler conversion.
turbosmblk
New Member
A500/42rh/42re swap is always a very very feasible swap as well. Then he gets his low gear set 904 with overdrive for Pennies on the dollar compared to a gear vendor.
Juan Veldez
Well-Known Member
Where is a good source for a 518? How does the slap-stick work with the overdrive of a 518? Can you purchase the mod'd cross member or do you fabricate it from the stock one? Sounds like a better option, so I'll look into it - thanks!
Online, I found Certified Transmissions - Idaho Transmission Warehouse in Boise that seems to have them. I'll check them out as they are right down the street.
Last edited:
Katfish
Well-Known Member
Adding the 518 is the best mod I've ever done, even better than the 5.7.
It's a little bit of work, but car is so much more enjoyable to drive.
Great info here:
727 to A518 swap a novice guide
Only 2600 RPM at 80mph, 26.7" tall tires, 3.73 gears
https://postimages.org/]
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It's a little bit of work, but car is so much more enjoyable to drive.
Great info here:
727 to A518 swap a novice guide
Only 2600 RPM at 80mph, 26.7" tall tires, 3.73 gears
https://postimages.org/]
[/url]
Juan Veldez
Well-Known Member
Awesome, thank you. I'm on a new mission...........
pschlosser
Well-Known Member
Yes, Juan, the transmission change to one with overdrive is a really nice upgrade and not too difficult. But you may want to do some research so you know what to expect. A wrecking yard is your least cost option for getting the transmission. Some use the money they save to have it rebuilt by a shop. Overdrive is only for the highway/freeway to save gas. One usually installs a switch to manually disengage the overdrive. But there are mods to do this automatically by adding some pressure sensors to the side of the tranny.
Xcudame
Well-Known Member
I made this bracket to use with the center console stock shifter and the 518. It locates off the two bottom overdrive tailshaft bolts.
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